It about the same price, if you use agency will be the same with start the new one when you get passport but you need to make sure you get it by the time passport expires, the only renew event you have to pay twice let say
Start new 35,000
Renew 18,000 bath Then renew in February 18,000 bath
So only 1000 different,
Renew it each time took 1 day that the good thing
The new one is waiting a month to get 15 months stamp but it mean you get more date but have to go out
If you don’t want to travel renew better option that mean you need to make sure it coming back by February